package com.demo.rpc.connection;

import com.demo.holder.ThreadContextHolder;
import com.demo.rpc.exception.RPCException;
import com.demo.rpc.manager.RPCTransactionalManager;

import java.sql.*;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.Executor;

/**
 * Created by hunter
 *
 * @Description 数据库连接代理类
 */
public abstract class RPCTransactionalConnProxy implements Connection {

    // 代理的连接
    protected Connection connection;

    public RPCTransactionalConnProxy(Connection connection) {
        this.connection = connection;
    }

    // ~--------- 主要关注这些方法 begin

    /**
     * commit方法着重处理
     *
     * @throws SQLException
     */
    @Override
    public abstract void commit() throws SQLException;

    /**
     * 回滚方法
     *
     * @throws SQLException
     */
    @Override
    public void rollback() throws SQLException {
        System.out.println("~------ proxy rollback ...");
        this.connection.rollback();
    }

    /**
     * 关闭连接方法, 这里用到连接池的话其实只是回收
     *
     * @throws SQLException
     */
    @Override
    public void close() throws SQLException {
        // 当前线程没有分布式事务才让关闭, 有的话要等待其它分布式事务任务结束，commit后才可关闭
        if (ThreadContextHolder.getTransactionId() == null) {
            System.out.println("~------ proxy close ...");
            connection.close();
        }
    }

    /**
     * 设置是否自动提交
     *
     * @param autoCommit
     * @throws SQLException
     */
    @Override
    public void setAutoCommit(boolean autoCommit) throws SQLException {
        // 当前线程没有分布式事务才让设置, spring的事务切面应该会在初始时设置成false, 结束后设置回原配置值, 这里如果有分布式事务不让它设置, 等提交后手动恢复
        if (ThreadContextHolder.getTransactionId() == null) {
            connection.setAutoCommit(autoCommit);
        }
    }

    /**
     * 处理分布式事务的提交请求
     *
     * @throws SQLException
     */
    public void handleRPCTransactionalCommit(RPCTransactionalManager rpcTransactionalManager,
                                             String rpcTransactionId,
                                             boolean autoCommit) throws SQLException {
        try {
            rpcTransactionalManager.waitRPCTransactionalTask(rpcTransactionId);
            System.out.println("~------ proxy rpc commit ...");
            this.connection.commit();
        } catch (RPCException e) {
            // 抓住RPCException 即回滚
            this.connection.rollback();
            // 继续抛出阻断当前线程
            throw e;
        } finally {
            // 恢复原始是否自动提交配置
            this.connection.setAutoCommit(autoCommit);
            // 一定要关闭, 这里不调用代理的close()的原因是当前可能还持有线程变量
            this.connection.close();
        }
    }

    // ~--------- 主要关注这些方法 end

    @Override
    public void rollback(Savepoint savepoint) throws SQLException {
        connection.rollback(savepoint);
    }


    @Override
    public Statement createStatement() throws SQLException {
        return connection.createStatement();
    }

    @Override
    public PreparedStatement prepareStatement(String sql) throws SQLException {
        return connection.prepareStatement(sql);
    }

    @Override
    public CallableStatement prepareCall(String sql) throws SQLException {
        return connection.prepareCall(sql);
    }

    @Override
    public String nativeSQL(String sql) throws SQLException {
        return connection.nativeSQL(sql);
    }

    @Override
    public boolean getAutoCommit() throws SQLException {
        return connection.getAutoCommit();
    }

    @Override
    public boolean isClosed() throws SQLException {
        return connection.isClosed();
    }

    @Override
    public DatabaseMetaData getMetaData() throws SQLException {
        return connection.getMetaData();
    }

    @Override
    public void setReadOnly(boolean readOnly) throws SQLException {
        connection.setReadOnly(readOnly);
    }

    @Override
    public boolean isReadOnly() throws SQLException {
        return connection.isReadOnly();
    }

    @Override
    public void setCatalog(String catalog) throws SQLException {
        connection.setCatalog(catalog);
    }

    @Override
    public String getCatalog() throws SQLException {
        return connection.getCatalog();
    }

    @Override
    public void setTransactionIsolation(int level) throws SQLException {
        connection.setTransactionIsolation(level);
    }

    @Override
    public int getTransactionIsolation() throws SQLException {
        return connection.getTransactionIsolation();
    }

    @Override
    public SQLWarning getWarnings() throws SQLException {
        return connection.getWarnings();
    }

    @Override
    public void clearWarnings() throws SQLException {
        connection.clearWarnings();
    }

    @Override
    public Statement createStatement(int resultSetType, int resultSetConcurrency) throws SQLException {
        return connection.createStatement(resultSetType, resultSetConcurrency);
    }

    @Override
    public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency) throws
            SQLException {
        return connection.prepareStatement(sql, resultSetType, resultSetConcurrency);
    }

    @Override
    public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency) throws SQLException {
        return connection.prepareCall(sql, resultSetType, resultSetConcurrency);
    }

    @Override
    public Map<String, Class<?>> getTypeMap() throws SQLException {
        return connection.getTypeMap();
    }

    @Override
    public void setTypeMap(Map<String, Class<?>> map) throws SQLException {
        connection.setTypeMap(map);
    }

    @Override
    public void setHoldability(int holdability) throws SQLException {
        connection.setHoldability(holdability);
    }

    @Override
    public int getHoldability() throws SQLException {
        return connection.getHoldability();
    }

    @Override
    public Savepoint setSavepoint() throws SQLException {
        return connection.setSavepoint();
    }

    @Override
    public Savepoint setSavepoint(String name) throws SQLException {
        return connection.setSavepoint(name);
    }

    @Override
    public void releaseSavepoint(Savepoint savepoint) throws SQLException {
        connection.releaseSavepoint(savepoint);
    }

    @Override
    public Statement createStatement(int resultSetType, int resultSetConcurrency, int resultSetHoldability) throws
            SQLException {
        return connection.createStatement(resultSetType, resultSetConcurrency, resultSetHoldability);
    }

    @Override
    public PreparedStatement prepareStatement(String sql, int resultSetType, int resultSetConcurrency, int
            resultSetHoldability) throws SQLException {
        return connection.prepareStatement(sql, resultSetType, resultSetConcurrency, resultSetHoldability);
    }

    @Override
    public CallableStatement prepareCall(String sql, int resultSetType, int resultSetConcurrency, int
            resultSetHoldability) throws SQLException {
        return connection.prepareCall(sql, resultSetType, resultSetConcurrency, resultSetHoldability);
    }

    @Override
    public PreparedStatement prepareStatement(String sql, int autoGeneratedKeys) throws SQLException {
        return connection.prepareStatement(sql, autoGeneratedKeys);
    }

    @Override
    public PreparedStatement prepareStatement(String sql, int[] columnIndexes) throws SQLException {
        return connection.prepareStatement(sql, columnIndexes);
    }

    @Override
    public PreparedStatement prepareStatement(String sql, String[] columnNames) throws SQLException {
        return connection.prepareStatement(sql, columnNames);
    }

    @Override
    public Clob createClob() throws SQLException {
        return connection.createClob();
    }

    @Override
    public Blob createBlob() throws SQLException {
        return connection.createBlob();
    }

    @Override
    public NClob createNClob() throws SQLException {
        return connection.createNClob();
    }

    @Override
    public SQLXML createSQLXML() throws SQLException {
        return connection.createSQLXML();
    }

    @Override
    public boolean isValid(int timeout) throws SQLException {
        return connection.isValid(timeout);
    }

    @Override
    public void setClientInfo(String name, String value) throws SQLClientInfoException {
        connection.setClientInfo(name, value);
    }

    @Override
    public void setClientInfo(Properties properties) throws SQLClientInfoException {
        connection.setClientInfo(properties);
    }

    @Override
    public String getClientInfo(String name) throws SQLException {
        return connection.getClientInfo(name);
    }

    @Override
    public Properties getClientInfo() throws SQLException {
        return connection.getClientInfo();
    }

    @Override
    public Array createArrayOf(String typeName, Object[] elements) throws SQLException {
        return connection.createArrayOf(typeName, elements);
    }

    @Override
    public Struct createStruct(String typeName, Object[] attributes) throws SQLException {
        return connection.createStruct(typeName, attributes);
    }

    @Override
    public void setSchema(String schema) throws SQLException {
        connection.setSchema(schema);
    }

    @Override
    public String getSchema() throws SQLException {
        return connection.getSchema();
    }

    @Override
    public void abort(Executor executor) throws SQLException {
        connection.abort(executor);
    }

    @Override
    public void setNetworkTimeout(Executor executor, int milliseconds) throws SQLException {
        connection.setNetworkTimeout(executor, milliseconds);
    }

    @Override
    public int getNetworkTimeout() throws SQLException {
        return connection.getNetworkTimeout();
    }

    @Override
    public <T> T unwrap(Class<T> iface) throws SQLException {
        return connection.unwrap(iface);
    }

    @Override
    public boolean isWrapperFor(Class<?> iface) throws SQLException {
        return connection.isWrapperFor(iface);
    }
}
